DE2647289A1 - PEDAL HUB FOR BICYCLES - Google Patents

Description

The invention "relates to one by means of ball bearings mounted pedal hub for bicycles, which comprises a hub body, through which a two ball bearing axle ver

runs ,

each ball bearing having an outer ring.

With such a hub type, the full axle is relatively heavy and the outer ring of the ball bearing is in one closed by a disc which "limits the axis movement, arranged cylindrical bearing bush.

It is therefore necessary to regulate the bearing play when installing it in the hub body. The trouble-free function and longevity of the bearings depend on this difficult and precise operation is, so / it is not so "for repair and maintenance work, i d-Le full of craftsmen, resellers or users" - "'- ■

709819/0248

which do not have the appropriate and indispensable Tools. A regulation of the bearing clearance left to the judgment of the Eeparateur is the correct one Function and service life of the bearing are not good:

- a game that is too weak or negative, which you can do with pre-compressed Finds storage, leads to inadmissibly high contact stresses between the balls and the raceway and thus through the material stress to wear and tear of the same;

- On the other hand, too much play allows the balls to move axially on their raceways, which leads to heating and deformation of the contact surfaces ο

The aim of the invention is to turn off these specialist parts and to create a lighter pedal hub.

This goal is achieved according to the invention by a pedal hub of the type mentioned in that it consists of a tubular, hollow axis of small thickness, means for axial control of the axis, two ball bearings mounted on the axis soxirie two form-fitting with the axis connected and arranged at their hollow ends inserts.

Another feature of the invention are the outer rings the ball bearings are each arranged in threaded bearing bushes, at least one of which is axially opposite the one in it bearing ring can be defeated and both of which are screwed into the internally threaded hub body.

In the design designed in this way, it is possible to change the position of the hub axle by turning the bearing bush carrying the ball bearing without changing the relative position of the ball bearings at the current axle,

703819/024 8

The invention is illustrated below with the aid of two exemplary embodiments explained in more detail with reference to the accompanying drawing. In the drawing show:

Fig. 1 is a section through the pedal in a first embodiment ;

2 shows a section through the pedal according to a second exemplary embodiment;

Fig. 3 is a section on an enlarged scale through a End of the pedal axis;

Fig. 4- a section through the pedal axis along the line IV-IV of FIGS. 3 and

Fig. 5 UHd 6 sections through one end of the pedal axis during a manufacturing phase.

The pedal hub shown in Fig. 1 consists of a tubular, hollow shaft 1, which is made of a very thin tube made of material with high impact resistance and low density, on which the inner rings of two dense ball bearings 2 are slipped, which against two shoulder-shaped Approaches to axis 1 are in contact. The outer bearing rings 2e are each arranged in a bearing bush 3 or 4-, the outer part 5 of which is provided with a thread and is screwed into the hub body 11 equipped with an internal thread. A pipe section 7 _5, the length of which corresponds to the distance between the two shoulder-shaped projections of the axis 1, represents a cross connection between the bearings 2. On the threaded parts 5 of the bearing bushes 3 ₅ 4- two nuts 6> 6 ^{1 are} screwed, the to fix the bearing bushes 3? ^ after adjusting the axis 1.

The axis 1 is adjusted as follows after the screw nuts 6, 6 ¹ have been removed: For example, the bearing bush 3 is screwed back a few turns towards the end of the axis 1. The resulting play between the outer ring 2e

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and the bearing bush 3 allows the axis 1 and the ball bearings 2 to be displaced in the direction of the arrow F. by an amount corresponding to the game. It is then sufficient that created between the outer ring and the bearing bush 4- Compensate for play by screwing the bearing bush back on the appropriate number of turns.

According to a feature according to the invention, the two wear Ends 10 of the tubular axis 1 is a stamped and internally threaded insert, which is form-fitting with the axis 1 and has peripheral grooves 9. The insert pieces 8 v / ground before thread cutting on the introduced at both ends 10 of the axle 1, as shown in FIG. Compartment Insertion of a centering pin into the insert in question the cross section of the one and the other end 10 is reduced by a press until the grooves 9 through the Material of the axis 1 are filled and the axis ends have assumed a frustoconical appearance that the Assembly and adjustment of the cranks carrying the pedals is facilitated. In this way you get a solid structural Unit, which is described in more detail with respect to FIGS. 3 and 4-. The insert 9 is then, as can be seen from Fig. 3 and 4- provided with an internal thread.

Fig. 2 shows another embodiment of the pedal, consisting from a tubular axis 101 on its lateral surface the raceways 111 of the balls 110 were introduced by cold forming in the rolling process. The axis 101 thus has the function of an inner ring common to the two bearings 102, the two outer rings being standardized Rings are. The identical ball bearings 102 formed in this way are in the bearing bushes screwed into the hub body 114 103 and 104- housed, the outer surface of which is provided with a thread, for an axial adjustment of the axial position to enable the axis 101, as has already been described with reference to FIG. 1. The one on the left in the figure

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Bearing 102 can move freely in the bore of its ■ concerned Move bearing bush 104- while bearing 102 is on the right side is locked by the bearing bush 103.

With this arrangement, the axial adjustment is obtained Axis 101 over bearing bush 103. As you can see, an axial movement of the bearing bush 103 leads at the same time to a displacement of the axis 101, if during the assembly between the bearing outer ring and the bearing bush ΊΟ4- axial play is left »

The axle ends are also provided with inserts, which in the same way as those of FIGS are made.

709813 / 02Λ8

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Claims (6)

Claims 1. pedal hub for bicycles, which is mounted by means of ball bearings, characterized in that it "consists of a tubular hollow shaft (1; 101) of small thickness, means for axial adjustment of the axis, two au ^'1 axis mounted ball bearings (2 ; 102) and two insert pieces (8) connected to the axle in a form-fitting manner and arranged at its hollow ends (10). 2. Pedal hub according to claim 1, characterized in that the ends of the tubular Axis (1; 101) are frustoconical and the respective milled inserts (8) are fixed opposite the ends of the tubular axis. 3 · Pedal hub according to claim 2, characterized in that the two raceways of the Rolling body by means of two cold forming in the outer surface of the tubular axis Grooves are formed. 4-. Method for making the tubular axle according to One of claims 1 to 3, characterized in that after inserting the insert pieces with peripheral grooves over the two ends of the tubular hollow axis and a centering pin in each of the inserts the ends of the axes are compressed in a press until a frustoconical Training the same receives and the material forming the axis firmly with the peripheral grooves of the insert pieces is engaged. - 7 709819/0248 5. Pedal hub according to claim 1, the hub body by the "two" each having an outer ring Tubular axis carrying ball bearings, characterized in that the "both outer rings (2e, 102e) of the ball bearings (2, 102) are each arranged in threaded bearing bushes (3,4-; 103,104}, of which at least one (5; 104} compared to the relevant one contained in it Outer ring of the bearing (2e; 102e) is arranged to be axially movable, the ones used for axial adjustment Bearing bushes are also screwed into the internally threaded hub body * (11; 114). 6. pedal hub according to claim 5? characterized , that the outer rings (2e; 102e) the ball bearing together with the tubular axle (1; 101} opposite a bearing bush (4j104) an axial movement of another bearing bush (3; 103) are axially movable towards the end of the axis 709819/0248